Suction gas producer for gasifying sawdust and like fuels



2 Sheets-Sheet l INVENTOR Hlld ,00F/mnd r ATTORNEY Aug. 26, 1924.

H. DORMAND SUCTION GAS PRODUCER FOR'GASIFYING SAWDUST AND LIKE, FUELSFiled July 17. 1925 Aug., 26, w24., i 1,506,227

H. DORE/HAND SUGTION GAS PRODUCER FOR GASIFYING SAWDUST AND LIKE FUELSFiled July 17, 1923 2 Sheets-Shee 2 4 INVENTOR H45 ATTORNEY .eectivemeans of retreated am. ze, i924.

intern earner carica.

HARROLD DORMAND, 0F BAYONN, NEW JERSEY.

SUCTION GAS PRQDUCER FOR GASIFYNG: SA'WDUST AND LME FUELS.

Application filed July 17, 1923. Serial No. 652,044.

To all whom t may concern:

Be it known that l, HARROLD DORMAND, a subject-of Great Britain, nowresiding in Bayonne, county of Hudson, and State of New Jersey, haveinvented certainnew andl useful improvements in Suction Gas Producersfor Gasifying Sawdust and Lilie Fuels, of which the following vis aspecification.

rlhis invention comprises certain improvements in suction gas producers,suitable for generating power gas by suction, and is particularlyapplicable to producers in which the gas is generated by sawdust orother like refuse.

The invention provides simple and edsctive means for insuring a uniform,automatic and continuous feed of such delicate fuel into the combustionvchamber. without any choking in the feed, evenly distributes the fuelinto the combustion chamber, there- Aby doing away with all poking" andinter- :tering with the combustion whilst the producer is'operating,also provides simple an fully maintaining the zones of combustion,thereby enriching the quality of the gas produced, prevents heavy Idistillation and allows the producer to suc# on line 2-2, Figi cessfullyoperate with a minimum depth of fuel bed.

The invention will be understood by rererence to the accompanyingdrawings, in which-- Fig. l is a sectional elevation of a gas producerembodyingv the invention, an

Fig. 2 is a sectional plan view of the saine Fig. 3 is a sectional feedgas producer embodying the invention,

and

Fig. d is a sectional plan'l view of the' same on line @-4, Fig. 3.

ln a convenient embodiment of this invention, the producer isconstructed with outer steel casing l and irebrick lining 16, fire grate3 with ash pit'chamber .7c below, all sealed from the atmosphere. One ormore feed bells 4 extend into the combus- 4 tion chamber. the reason forplural feeds,

being, if used, to increase the suction area without materiallyincreasing the height of the producer. rli`he feed bell or bells 4 areso designed as to cause the fuel preferably sawdust to be evenlydistributed over the suction area, by means of a plurality ot fuel inthe combustion the chamber. elevation of a doublefeed apertures 4e", at,or near, the lower extremity .of each feed, of rectangular or othersuitable shape, and lof sizes to meet existing requirements. rll`helheight of the ,l chamber is therefore regulated by the height of theapertures in the feed bell or bells. l have indicated the normal surfaceof the fuel by the dotted lines a, and it is this surface which ll-termsuction area, having reference to the suction of the engine or pumpwithdrawing the gas through the outlets 7. The feed `'bells may beslightly conical in shape towards the lower part, 'or in other Awordsdared, to allow for the swelling of moist 4fuel, but not suliiciently so@te interfere with the efficient working of the apertures.

The storage hopper 5 being always maintained full, the gravitation ofthis column or fuel causes the saine to be forced through the apertureson to the suction area, feeding the centre of combustion at the sametime, and to prevent'too heavy a dowd ing of uel, yafter the apertureshave done their work, a vacuum chamber 6 is positioned at the lower partof the storage hopper, which .stays the movement, momentarily, at thatpoint, and stops unnecessary fuel being dumped into the chamber.

lt will be noted that located adjacent the combustion chamber avsuitable distance above the grate 3 is an annular vaporizer chamber 8,exposed to the maximum heat of the combustion zone. rl`his vaporizerchamber is connected with an inlet 9 and a tan 10 is provided torforcing air into rli`lie chamber 8 also is connected with water eedpipes ll so that water may be delivered in suitable quantities.' Thevapor produced within the chamber 8 is drawn into the combustion zone,where the chemical actionl ot gas making is goinP on, via vapor conduitsi2 which lead irom the chamber to points in the ash it. 'lhus means areprovided whereby t e zones of combustion can be maintained, and too higha temperature reduced at will, (hirh temperatures being detrimental tothe eilicient working of the producer) by the introduction of watervapor, mixed with the air necessary for the gasmaking, and which is'sucked into the burning mass.

An overflow pipe the va.-

whilst being used, for the zones of combustion to porizer, not beingvaporized, therefore not necessary, on account of reduced temperature.

The admission of water vapor into the combustion zone is only necessary,when there is not sufiicient moisture 1n the fuel will help to scrub outthe all poking or interfering with the combus tion Whilst operating inthe following man- Y ner:

IVhenthe suction stroke causes a suction in Athe upper part of thecombustion chamber, this suction area is immediately filled with gas,and at the Sametime the whole body of fuel'in combustion, being so lightin weight, is lifted, and immediately after falls again. After each fallthe apertures replenish the suction area with fresh fuel, the action ofthe vacuum chamber of the feed hopper arresting too heavy a fall offuel, and this continues in automatic motion with each suction stroke.

It will be noted that an insulating chamber 14 surrounds the entirecombustion chamber and extends to the horizontal upper wall 15 whichsupports the feed bell or bells 4. 'A vitreous lining 16 is disposedintermediate the insulating chamber and the combustion chamber and isoutwardly fiaring above the vaporizer chamber to restrict the combustionchamber at and belo-w the normal surface line of greatest combustionwhich I-have indicated by the dotted line I). yThe vitreous lining 16coacts with the vaporizer chamber to restrict the combustion chamberbelow the flaring section of the latter.

What I claim is:

A suction gas producer for gasifying sawdust and like fuels comprising acas-- ino', a fire gra-te separating combustion and as pit chambers, afeed pipe projecting into the combustion vchamber and formed withlateral apertures, for the vpassage of the fuel, a horizontal wallclosing the top ofthe combustion chamber and affording a support for thefeed pipe, an insulating lining surrounding the combustion chamber andextending upwardly to` said horizontal wall, an annular vaporizersurrounding the combustion chamber, means for admitting air andmoist-ure to said vaporizer and for leading vapor therefrom to thecombustion chamber, anda vitreous lining intermediate the' insulatinglining and the combustion chamber and outwardly flaring to enlarge thecombustion chamber above said vaporizer and coacting with the vaporizerto restrict the combustion chamber below the A Haring section. Y

In testimony whereof, I have signed my name to this specification in thepresence of two subscribing witnesses.

HARROLD DORMAND.

Witnesses:

. W. LEE HELMS, p F. H. LOGAN.

